How to draw an image (a straight line) with positive scale function y = 3x It's best to state its steps

How to draw an image (a straight line) with positive scale function y = 3x It's best to state its steps

Find two datum points. Let x = 0, get y = 0, determine a point (0,0)
Let x = 1, y = 3, and determine another point (1,3)
Two points make a straight line